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Chapter 14: A Collection of Useful Classes


In this chapter we'll be looking at some more very useful classes in the java.util package but this time they are not collection classes – just a collection of classes. We will also be looking at the facilities provided by classes in the java.util.regex package that implements regular expressions in Java. Support for regular expressions is a very powerful and important addition to Java.

In this chapter you will learn:

  • How to use the static methods in the Arrays class for filling, comparing, sorting, and searching arrays

  • How to use the Observable class and the Observer interface to communicate between objects

  • What facilities the Random class provides

  • How to create and use Date and Calendar objects

  • What regular expressions are and how you can create and use them

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